﻿// The Nova Project by Ken Beckett.
// Copyright (C) 2007-2012 Inevitable Software, all rights reserved.
// Released under the Common Development and Distribution License, CDDL-1.0: http://opensource.org/licenses/cddl1.php

using System.Collections.Generic;

using Nova.CodeDOM;

namespace Nova.UI
{
    /// <summary>
    /// The view model for a <see cref="CodeDOM.BaseListTypeDecl"/>.
    /// </summary>
    public abstract class BaseListTypeDeclVM : TypeDeclVM
    {
        #region /* FIELDS */

        protected ChildListVM<ExpressionVM> _baseTypeVMs;

        #endregion

        #region /* CONSTRUCTORS */

        /// <summary>
        /// Create a view model instance for the specified <see cref="CodeDOM.BaseListTypeDecl"/>.
        /// </summary>
        protected BaseListTypeDeclVM(BaseListTypeDecl baseListTypeDecl, bool isDescription, Dictionary<CodeObject, CodeObjectVM> dictionary)
            : base(baseListTypeDecl, isDescription, dictionary)
        {
            _baseTypeVMs = CreateListVM<Expression, ExpressionVM>(baseListTypeDecl.BaseTypes, dictionary);
        }

        #endregion

        #region /* PROPERTIES */

        /// <summary>
        /// The underlying <see cref="CodeDOM.BaseListTypeDecl"/> model.
        /// </summary>
        public BaseListTypeDecl BaseListTypeDecl
        {
            get { return (BaseListTypeDecl)CodeObject; }
        }

        /// <summary>
        /// The list of base types.
        /// </summary>
        public ChildListVM<ExpressionVM> BaseTypeVMs
        {
            get { return _baseTypeVMs; }
        }

        /// <summary>
        /// True if there are any base types.
        /// </summary>
        public bool HasBaseTypeVMs
        {
            get { return (_baseTypeVMs != null && _baseTypeVMs.Count > 0); }
        }

        #endregion

        #region /* METHODS */

        #endregion

        #region /* RENDERING */

        protected override void RenderSuffix(CodeRenderer renderer, RenderFlags flags)
        {
            if (!HasBaseTypeVMs && !flags.HasFlag(RenderFlags.Description))
                RenderTerminator(renderer, flags);
        }

        protected override void RenderAfter(CodeRenderer renderer, RenderFlags flags)
        {
            RenderAnnotations(renderer, AnnotationFlags.IsInfix1, flags);

            if (HasBaseTypeVMs)
            {
                // Increase the indent level for any newlines that occur within the child list unless specifically told not to
                bool increaseIndent = !flags.HasFlag(RenderFlags.NoIncreaseIndent);
                if (increaseIndent)
                    renderer.IndentOnNewLineBegin(ParentVM);

                RenderFlags passFlags = (flags & RenderFlags.PassMask);
                if (_baseTypeVMs[0].IsFirstOnLine)
                {
                    // If the first base type is on a new line, create a new line now for the ':'
                    renderer.NewLine();
                    passFlags |= RenderFlags.SuppressNewLine;
                }
                else
                    renderer.RenderText(" ", PUNC_BRUSH, this);

                // Render any prefix annotations for the first item in the list before the ':'
                _baseTypeVMs[0].RenderAnnotations(renderer, flags);
                renderer.RenderText(BaseListTypeDecl.ParseToken + " ", PUNC_BRUSH, this);
                renderer.RenderList(_baseTypeVMs, passFlags | RenderFlags.NoPreAnnotations | (HasConstraintClauseVMs ? 0 : RenderFlags.HasTerminator), this);

                // Reset the indent level
                if (increaseIndent)
                    renderer.IndentOnNewLineEnd(ParentVM);
            }

            base.RenderAfter(renderer, flags);
        }

        public override void UnRender()
        {
            ChildListHelpers.UnRender(_baseTypeVMs);
            base.UnRender();
        }

        #endregion
    }
}
